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                                <h2 id="32--switch&#x8BED;&#x53E5;">3.2  switch&#x8BED;&#x53E5;</h2>
<p>&#x2003;&#x2003;&#x7F16;&#x5199;&#x7A0B;&#x5E8F;&#xFF0C;&#x5B8C;&#x6210;&#x5982;&#x4E0B;&#x9700;&#x6C42;&#x3002;</p>
<p>&#x2003;&#x2003;&#x5B66;&#x751F;&#x5F20;&#x660E;&#x53C2;&#x52A0;&#x4E86;&#x5C11;&#x5E74;&#x5BAB;&#x7EC4;&#x7EC7;&#x7684;&#x7F8E;&#x672F;&#x5B66;&#x4E60;&#x73ED;&#xFF0C;&#x5230;&#x4E86;&#x5B66;&#x4E60;&#x73ED;&#x7ED3;&#x675F;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5F20;&#x660E;&#x7684;&#x7236;&#x4EB2;&#x544A;&#x8BC9;&#x5F20;&#x660E;&#xFF1A;</p>
<p>&#x2003;&#x2003;&#x5982;&#x679C;&#x5B66;&#x4E60;&#x73ED;&#x7ED3;&#x4E1A;&#x8BC4;&#x4EF7;&#x662F;1&#x7B49;&#xFF0C;&#x5219;&#x4F1A;&#x201C;&#x6691;&#x5047;&#x5E26;&#x5F20;&#x660E;&#x53BB;&#x4E5D;&#x5BE8;&#x6C9F;&#x65C5;&#x6E38;&#xFF01;&#x201D;&#xFF1B;</p>
<p>&#x2003;&#x2003;&#x5982;&#x679C;&#x5B66;&#x4E60;&#x73ED;&#x7ED3;&#x4E1A;&#x8BC4;&#x4EF7;&#x662F;2&#x7B49;&#xFF0C;&#x5219;&#x4F1A;&#x201C;&#x5956;&#x52B1;&#x4E00;&#x4E2A;&#x53D8;&#x5F62;&#x91D1;&#x521A;&#xFF01;&#x201D;&#xFF1B;</p>
<p>&#x2003;&#x2003;&#x5982;&#x679C;&#x5B66;&#x4E60;&#x73ED;&#x7ED3;&#x4E1A;&#x8BC4;&#x4EF7;&#x662F;3&#x7B49;&#xFF0C;&#x5219;&#x4F1A;&#x201C;&#x4E0D;&#x5956;&#x4E0D;&#x7F5A;&#xFF0C;&#x9700;&#x8981;&#x7EE7;&#x7EED;&#x52AA;&#x529B;&#xFF01;&#x201D;&#xFF1B;</p>
<p>&#x2003;&#x2003;&#x5982;&#x679C;&#x5B66;&#x4E60;&#x73ED;&#x7ED3;&#x4E1A;&#x8BC4;&#x4EF7;&#x662F;4&#x7B49;&#xFF0C;&#x5219;&#x4F1A;&#x201C;&#x8D1F;&#x8D23;&#x5BB6;&#x91CC;&#x6D17;&#x7897;&#x4E00;&#x5468;&#xFF01;&#x201D;&#x3002;</p>
<p>&#x2003;&#x2003;&#x8FD9;&#x6837;&#x7684;&#x9700;&#x6C42;&#xFF0C;&#x901A;&#x8FC7;&#x524D;&#x9762;&#x4ECB;&#x7ECD;&#x7684;if&#x8BED;&#x53E5;&#x5B8C;&#x5168;&#x53EF;&#x4EE5;&#x89E3;&#x51B3;&#xFF0C;&#x4F46;&#x662F;&#x4F5C;&#x4E3A;&#x7A0B;&#x5E8F;&#x5458;&#xFF0C;&#x603B;&#x4F1A;&#x89C9;&#x5F97;&#x6709;&#x4E9B;&#x9EBB;&#x70E6;&#xFF0C;&#x6709;&#x4E9B;&#x4E0D;&#x8212;&#x670D;&#x3002;&#x63A5;&#x4E0B;&#x6765;&#xFF0C;&#x901A;&#x8FC7;switch&#x8BED;&#x53E5;&#x89E3;&#x51B3;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#x3002;</p>
<h3 id="321--switch&#x8BED;&#x53E5;&#x6982;&#x8FF0;">3.2.1  switch&#x8BED;&#x53E5;&#x6982;&#x8FF0;</h3>
<p>&#x2003;&#x2003;switch&#x8BED;&#x53E5;&#x7684;&#x8BED;&#x6CD5;&#x5F62;&#x5F0F;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code>switch(&#x8868;&#x8FBE;&#x5F0F;){

    case  &#x5E38;&#x91CF;1:

        &#x4EE3;&#x7801;&#x5757;A;

        break;

    case  &#x5E38;&#x91CF;2:

        &#x4EE3;&#x7801;&#x5757;B;

        break;

    &#x2026;

    default:

        &#x4EE3;&#x7801;&#x5757;X;

        break;

}
</code></pre><p>&#x2003;&#x2003;switch&#x5173;&#x952E;&#x5B57;&#x8868;&#x793A;&#x201C;&#x5F00;&#x5173;&#x201D;&#xFF0C;&#x5176;&#x9488;&#x5BF9;&#x7684;&#x662F;&#x540E;&#x9762;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x503C;&#x3002;&#x5C24;&#x5176;&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;&#x8FD9;&#x4E2A;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x503C;&#x53EA;&#x5141;&#x8BB8;&#x662F;byte&#x3001;short&#x3001;int&#x548C;char&#x7C7B;&#x578B;&#xFF08;&#x5728;JDK 7.0&#x4E2D;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x503C;&#x53EF;&#x4EE5;&#x662F;String&#xFF09;&#x7C7B;&#x578B;&#x3002;</p>
<p>&#x2003;&#x2003;case&#x540E;&#x5FC5;&#x987B;&#x8981;&#x8DDF;&#x4E00;&#x4E2A;&#x4E0E;&#x8868;&#x8FBE;&#x5F0F;&#x7C7B;&#x578B;&#x5BF9;&#x5E94;&#x7684;&#x5E38;&#x91CF;&#xFF0C;case&#x53EF;&#x4EE5;&#x6709;&#x591A;&#x4E2A;&#xFF0C;&#x4E14;&#x987A;&#x5E8F;&#x53EF;&#x4EE5;&#x6539;&#x53D8;&#xFF0C;&#x4F46;&#x662F;&#x6BCF;&#x4E2A;case&#x540E;&#x9762;&#x7684;&#x5E38;&#x91CF;&#x503C;&#x5FC5;&#x987B;&#x4E0D;&#x540C;&#x3002;&#x5F53;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x5B9E;&#x9645;&#x503C;&#x4E0E;case&#x540E;&#x7684;&#x5E38;&#x91CF;&#x76F8;&#x7B49;&#x65F6;&#xFF0C;&#x5176;&#x540E;&#x7684;&#x4EE3;&#x7801;&#x5757;&#x5C31;&#x4F1A;&#x6267;&#x884C;&#x3002;</p>
<p>&#x2003;&#x2003;default&#x8868;&#x793A;&#x5F53;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x5B9E;&#x9645;&#x503C;&#x6CA1;&#x6709;&#x5339;&#x914D;&#x5230;&#x524D;&#x9762;&#x5BF9;&#x5E94;&#x7684;&#x4EFB;&#x4F55;case&#x5E38;&#x91CF;&#xFF0C;default&#x540E;&#x9762;&#x7684;&#x9ED8;&#x8BA4;&#x4EE3;&#x7801;&#x5757;&#x4F1A;&#x88AB;&#x6267;&#x884C;&#xFF0C;default&#x901A;&#x5E38;&#x653E;&#x5728;&#x672B;&#x5C3E;&#x3002;</p>
<p>&#x2003;&#x2003;break&#x8868;&#x793A;&#x8DF3;&#x51FA;&#x5F53;&#x524D;&#x7ED3;&#x6784;&#xFF0C;&#x5FC5;&#x987B;&#x6CE8;&#x610F;&#x4E0D;&#x8981;&#x5FD8;&#x8BB0;&#x3002;</p>
<h3 id="322--switch&#x8BED;&#x53E5;&#x7684;&#x4F7F;&#x7528;">3.2.2  switch&#x8BED;&#x53E5;&#x7684;&#x4F7F;&#x7528;</h3>
<p>&#x2003;&#x2003;&#x6839;&#x636E;&#x524D;&#x9762;&#x7684;&#x9700;&#x6C42;&#xFF0C;&#x4F7F;&#x7528;switch&#x8BED;&#x53E5;&#x7F16;&#x5199;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code>import java.util.Scanner;

class TestSwitch1{

    public static void main(String[] args) {

        int score = -1;               //&#x7F8E;&#x672F;&#x5B66;&#x4E60;&#x73ED;&#x7ED3;&#x4E1A;&#x8BC4;&#x4EF7;

        Scanner input = new Scanner(System.in);

        System.out.print(&quot;&#x8BF7;&#x8F93;&#x5165;&#x5F20;&#x660E;&#x7F8E;&#x672F;&#x5B66;&#x4E60;&#x73ED;&#x7ED3;&#x4E1A;&#x8BC4;&#x4EF7;&#xFF08;&#x53EA;&#x80FD;&#x8F93;&#x5165;1&#x3001;2&#x3001;3&#x3001;4&#xFF09;&#xFF1A;&quot;);

        score = input.nextInt();          //&#x4ECE;&#x63A7;&#x5236;&#x53F0;&#x83B7;&#x53D6;&#x5F20;&#x660E;&#x7F8E;&#x672F;&#x5B66;&#x4E60;&#x73ED;&#x7ED3;&#x4E1A;&#x8BC4;&#x4EF7;



        switch(score){

            case 1:

                   System.out.println(&quot;&#x6691;&#x5047;&#x5E26;&#x5F20;&#x660E;&#x53BB;&#x4E5D;&#x5BE8;&#x6C9F;&#x65C5;&#x6E38;&#xFF01;&quot;);

                break;

            case 2:

                System.out.println(&quot;&#x5956;&#x52B1;&#x4E00;&#x4E2A;&#x53D8;&#x5F62;&#x91D1;&#x521A;&#xFF01;&quot;);           

                break;

            case 3:

                System.out.println(&quot;&#x4E0D;&#x5956;&#x4E0D;&#x7F5A;&#xFF0C;&#x9700;&#x8981;&#x7EE7;&#x7EED;&#x52AA;&#x529B;&#xFF01;&quot;);

                break;

            case 4:

                System.out.println(&quot;&#x8D1F;&#x8D23;&#x5BB6;&#x91CC;&#x6D17;&#x7897;&#x4E00;&#x5468;&#xFF01;&quot;);

                break;

            default:

                System.out.println(&quot;&#x8F93;&#x5165;&#x9519;&#x8BEF;&#xFF0C;&#x8BF7;&#x91CD;&#x65B0;&#x8F93;&#x5165;&#xFF01;&quot;);

                break;

        }

    }

}
</code></pre><p>&#x2003;&#x2003;&#x901A;&#x8FC7;&#x89C2;&#x5BDF;&#x53EF;&#x4EE5;&#x770B;&#x51FA;&#xFF0C;switch&#x8BED;&#x53E5;&#x7684;&#x5224;&#x65AD;&#x6761;&#x4EF6;&#x53EA;&#x80FD;&#x662F;&#x7B49;&#x503C;&#x5224;&#x65AD;&#xFF0C;&#x800C;&#x4E14;&#x5BF9;&#x8868;&#x8FBE;&#x5F0F;&#x7684;&#x7C7B;&#x578B;&#x6709;&#x8981;&#x6C42;&#x3002;</p>
<p>&#x2003;&#x2003;&#x524D;&#x9762;&#x63D0;&#x5230;&#x8FC7;&#xFF0C;&#x8BED;&#x53E5;&#x5757;&#x540E;&#x9762;&#x9700;&#x8981;&#x8DDF;&#x4E0A;break&#xFF0C;&#x4E0D;&#x80FD;&#x5FD8;&#x8BB0;&#xFF0C;&#x5982;&#x679C;&#x5FD8;&#x4E86;&#x4F1A;&#x51FA;&#x73B0;&#x4EC0;&#x4E48;&#x60C5;&#x51B5;&#x5462;&#xFF1F;&#x628A;&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#x7684;break&#x8BED;&#x53E5;&#x5168;&#x90E8;&#x53BB;&#x6389;&#xFF0C;&#x7F16;&#x8BD1;&#x8FD0;&#x884C;&#x7A0B;&#x5E8F;&#xFF0C;&#x7A0B;&#x5E8F;&#x8FD0;&#x884C;&#x7ED3;&#x679C;&#x5982;&#x56FE;3.5&#x6240;&#x793A;&#x3002;</p>
<p><center><img src="https://labfile.oss.aliyuncs.com/library/textbook-java1/img/d3z/tu3.5.png"></center></p>
<p><center> &#x56FE;3.5  &#x53BB;&#x9664;break&#x7684;switch&#x8BED;&#x53E5; </center><br>&#x2003;&#x2003;&#x4ECE;&#x8FD0;&#x884C;&#x7ED3;&#x679C;&#x53EF;&#x4EE5;&#x770B;&#x51FA;&#xFF0C;&#x5F53;&#x7528;&#x6237;&#x8F93;&#x5165;&#x201C;2&#x201D;&#x540E;&#xFF0C;&#x6267;&#x884C;case 2&#x540E;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x5757;&#xFF0C;&#x800C;&#x4E14;&#x5C06;&#x4E0D;&#x518D;&#x5224;&#x65AD;case 2&#x4E4B;&#x540E;&#x7684;&#x6240;&#x6709;case&#x8BED;&#x53E5;&#xFF0C;&#x76F4;&#x63A5;&#x6267;&#x884C;&#x540E;&#x9762;&#x6240;&#x6709;&#x7684;&#x4EE3;&#x7801;&#x5757;&#x3002;&#x5229;&#x7528;&#x8FD9;&#x4E2A;&#x7279;&#x70B9;&#xFF0C;&#x53EF;&#x4EE5;&#x5B8C;&#x6210;&#x9488;&#x5BF9;&#x51E0;&#x4E2A;&#x4E0D;&#x540C;&#x7684;&#x503C;&#xFF0C;&#x6267;&#x884C;&#x4E00;&#x7C7B;&#x4EE3;&#x7801;&#x7684;&#x64CD;&#x4F5C;&#x3002;&#x4F8B;&#x5982;&#x4E0A;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#xFF0C;&#x9700;&#x6C42;&#x8FDB;&#x884C;&#x4E86;&#x5982;&#x4E0B;&#x8C03;&#x6574;&#xFF1A;</p>
<p>&#x2003;&#x2003;&#x5982;&#x679C;&#x5B66;&#x4E60;&#x73ED;&#x7ED3;&#x4E1A;&#x8BC4;&#x4EF7;&#x662F;1&#x7B49;&#x6216;2&#x7B49;&#xFF0C;&#x5219;&#x4F1A;&#x201C;&#x6691;&#x5047;&#x5E26;&#x5F20;&#x660E;&#x53BB;&#x4E5D;&#x5BE8;&#x6C9F;&#x65C5;&#x6E38;&#xFF01;&#x201D;&#xFF1B;</p>
<p>&#x2003;&#x2003;&#x5982;&#x679C;&#x5B66;&#x4E60;&#x73ED;&#x7ED3;&#x4E1A;&#x8BC4;&#x4EF7;&#x662F;3&#x7B49;&#x6216;4&#x7B49;&#xFF0C;&#x5219;&#x4F1A;&#x201C;&#x4E0D;&#x5956;&#x4E0D;&#x7F5A;&#xFF0C;&#x9700;&#x8981;&#x7EE7;&#x7EED;&#x52AA;&#x529B;&#xFF01;&#x201D;&#x3002;</p>
<p>&#x2003;&#x2003;&#x5219;&#x5BF9;&#x5E94;&#x7684;&#x4EE3;&#x7801;&#x53EF;&#x4EE5;&#x4FEE;&#x6539;&#x4E3A;&#x4EE5;&#x4E0B;&#x5F62;&#x5F0F;&#xFF08;&#x4EC5;&#x663E;&#x793A;&#x90E8;&#x5206;&#x4EE3;&#x7801;&#xFF09;&#x3002;</p>
<pre><code>switch(score){

    case 1:

    case 2:

        System.out.println(&quot;&#x6691;&#x5047;&#x5E26;&#x5F20;&#x660E;&#x53BB;&#x4E5D;&#x5BE8;&#x6C9F;&#x65C5;&#x6E38;&#xFF01;&quot;);                  

           break;

    case 3:

    case 4:

        System.out.println(&quot;&#x4E0D;&#x5956;&#x4E0D;&#x7F5A;&#xFF0C;&#x9700;&#x8981;&#x7EE7;&#x7EED;&#x52AA;&#x529B;&#xFF01;&quot;);

        break;

    default:

        System.out.println(&quot;&#x8F93;&#x5165;&#x9519;&#x8BEF;&#xFF0C;&#x8BF7;&#x91CD;&#x65B0;&#x8F93;&#x5165;&#xFF01;&quot;);

        break;

}
</code></pre>
                                
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